diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 3c789613..d9e2309a 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -223,7 +223,7 @@ GEM
     pathutil (0.16.1)
       forwardable-extended (~> 2.6)
     public_suffix (2.0.5)
-    rack (1.6.11)
+    rack (1.6.13)
     rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)